linux/unwind.c

/*

   honggfuzz - architecture dependent code (LINUX/UNWIND)
   -----------------------------------------

   Author: Robert Swiecki <swiecki@google.com>

   Copyright 2010-2015 by Google Inc. All Rights Reserved.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

*/

#include "common.h"
#include "linux/unwind.h"

#include <libunwind-ptrace.h>

#include "log.h"

size_t arch_unwindStack(pid_t pid, funcs_t * funcs)
{
    unw_addr_space_t as = unw_create_addr_space(&_UPT_accessors, __BYTE_ORDER);
    if (!as) {
        LOGMSG(l_ERROR, "unw_create_addr_space() failed");
        return 0U;
    }

    void *ui = _UPT_create(pid);
    if (ui == NULL) {
        LOGMSG(l_ERROR, "_UPT_create(%d) failed", pid);
        return 0U;
    }

    unw_cursor_t c;
    if (unw_init_remote(&c, as, ui) != 0) {
        LOGMSG(l_ERROR, "unw_init_remote() failed");
        return 0U;
    }

    size_t ret = 0;
    for (ret = 0; unw_step(&c) > 0; ret++) {
        unw_word_t ip;
        unw_get_reg(&c, UNW_REG_IP, &ip);
        funcs[ret].pc = (void *)ip;
    }

    unw_destroy_addr_space(as);
    _UPT_destroy(ui);

    return ret;
}